[Alan Winslow]

I have an old HTPC wih a geforce 6600 video card and Theatertek DVD player. With the projector I have now the video processor is a DVDO VP50

upscaling to 1080p. My question is for SD DVD playback I am going DVI/HDMI from the HTPC to the processor with the computer display set a 640 x 480. The display in the VP 50 reads it is a VGA/ 60hz input where when I run component from a DVD player at 480i it actually displays it is 480i/60 hz input.

Is 640 x 480 vga an interlaced 480i signal. The picture looks very good butI want to be sure I am truley feeding 480i.

Thanks

 

[steven975]

no, it is progressive.

 

[sneals2000]



Quote:
Originally Posted by Alan Winslow /forum/post/15401389


I have an old HTPC wih a geforce 6600 video card and Theatertek DVD player. With the projector I have now the video processor is a DVDO VP50

upscaling to 1080p. My question is for SD DVD playback I am going DVI/HDMI from the HTPC to the processor with the computer display set a 640 x 480. The display in the VP 50 reads it is a VGA/ 60hz input where when I run component from a DVD player at 480i it actually displays it is 480i/60 hz input.

Is 640 x 480 vga an interlaced 480i signal. The picture looks very good butI want to be sure I am truley feeding 480i.

Thanks

No - 640x480 VGA is effectively 480p not 480i. PC VGA resolutions are nearly universally progressive, not interlaced. (This isn't to say that the VGA connector can't carry interlaced video - just that most standard video drivers will only output VGA progressive formats.)


Powerstrip may allow you to create a 640x480 interlaced resolution (though 720x480i may be better as most DVDs are 720x480 non-square pixels) - however in most cases your PC will be de-interlacing to 480p, so a 480i output will be a re-interlace of a de-interlace, not a clean pass-through? (Though it MAY be possible to force this by using a weave de-interlace and ensuring the field dominance is right?)

 

[Dodgexander]

You should be able to create custom resolutions in the nvidia control panel. Otherwise powerstrip is your best bet.

 

[Bigbird999]

If your card has a TV out (s-video or composite) it will be an interlaced signal. But, why do you want 480i instead of 480p? Just curious.


BB

 

[Alan Winslow]

Thanks for all the responses.

BB, The DVDO VP50 does a great job deinterlacing 480i to 1080p especially from a digital HDMI signal. The next level is SDI which I am trying to avoid. I have tried component signal and there is definitely a better picture via the DVI output.

I am using a CRT projector so everything is feeding the projector via the processor.

Thanks

 

[Metric]

SD dvds are 720x480 or 720x576 i believe?

 

[stanger89]



Quote:
Originally Posted by Alan Winslow /forum/post/15401389


I have an old HTPC wih a geforce 6600 video card and Theatertek DVD player. With the projector I have now the video processor is a DVDO VP50

upscaling to 1080p. My question is for SD DVD playback I am going DVI/HDMI from the HTPC to the processor with the computer display set a 640 x 480. The display in the VP 50 reads it is a VGA/ 60hz input where when I run component from a DVD player at 480i it actually displays it is 480i/60 hz input.

Is 640 x 480 vga an interlaced 480i signal. The picture looks very good butI want to be sure I am truley feeding 480i.

Thanks

First you want 720x480 not 640x480 since that's the resolution of DVD. If you really want true, untouched 480i a PC is not your best bet.


About the closest you can come to untouched 480i is 720x480 resolution, and make sure deinterlacing in your player is set to Weave. And with the VP50 (with PREP) it shouldn't really matter if it's i or p since the VP50 should be able to process it either way (unless PREP is disabled on VGA input).

 

[pender]

It is a progressive signal, but right resolution for 4:3. 480p 16:9 is 852x480p.

 

[sotti]



Quote:
Originally Posted by pender /forum/post/15408234


It is a progressive signal, but right resolution for 4:3. 480p 16:9 is 852x480p.

except DVD is native 720x480

 

[sneals2000]

If you want the best quality source for upscaling on your processor - I suspect you'll need something like either a DVD player with SDI output mod, or possibly something like a Real Magic hardware MPEG2 decoder card, which has the ability to output 601/656 YCrCb digital video via an internal header - though how you get this into your scaler I can't remember? (The latter is pretty ancient and probably not supported by Vista?)


Otherwise something like a Popcorn Hour with 480i/576i component - and I think HDMI outputs (may not be 480/576i over HDMI) may be a go-er? (It will play ISOs and VIDEO_TS folders from a PC/Mac share via Ethernet - and uses the same chipset family as some Blu-ray players.)


As for resolutions - if you want the scaler to do all the work then you need to run at 720x480 or 720x576 - as this is the native (and non-square pixel/sample) resolution for both 4:3 and 16:9 DVDs (usually - there are a few variations allowed in the spec) Incidentally - the 720 sample format is a little bit wider than 4:3 or 16:9... (In 50Hz-land you scale 702x576 to 4:3 or 16:9 - NOT 720x576, in 60Hz-land the numbers are a little different)


640x480 and 854x480 are the square-pixel/sample formats for 4:3 and 16:9 480i - but they aren't good for clean output of DVDs for external scaling - as they themselves require scaling from 720x480 (and scaling 720x480 to 640x480 will lose you some detail horizontally)

 

[Alan Winslow]

Thank you all for the helpful info. When changing the HTPC resolution to 720 x 480 the VP50 does accept and recognizes it as a 480p signal. In the setting I could not find a way to change to interlaced. I am going to pursue an SDI player setup. Thanks

 

[stanger89]



Quote:
Originally Posted by Alan Winslow /forum/post/15414907


Thank you all for the helpful info. When changing the HTPC resolution to 720 x 480 the VP50 does accept and recognizes it as a 480p signal. In the setting I could not find a way to change to interlaced.

Change the refresh rate to 30Hz, that usually does it.

Quote:
I am going to pursue an SDI player setup. Thanks

Before you do that, I'd just look for an HDMI solution. If you just want to play discs, I think an Oppo will do 480i over HDMI. If you want to play rips, I'd look at a PopcornHour or SageTV HD Theater.

 

[Alan Winslow]

I did try an Oppo but am up against the HDCP issue. Even the Oppo at 480i has HDCP enabled and with having a CRT projector would like a solution without it. Thanks